Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e19e3fe5c4419e4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 03:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24054a8ba418c2f371dfc853703adc6c SHA-1: 996e4a64a5b76308cb7a5a4bc9f8b795839f2385 SHA-256: 1e19e3fe5c4419e402b095fc21b5d621396f7af318f6548a3035e1c5a67f2ae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous embedded URLs pointing to a link farm, with one specific URL being a potential lure for a 'verbal aptitude test'. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://elliptical-trainers.ru/ckfinder/userfiles/files/narola.pdf In PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/49310237048.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/waxezitogofik.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/56255780053.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/31237749629.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/jiruwedizutagemuxijozis.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/48001728705.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/munomi.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rubor.pdfIn PDF document text
    • https://triosms.com/userfiles/file/fepudowufemomatotowem.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/87019549470.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/84937972824.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/33486687801.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/80625456413.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/ruzulapexad.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/17569984498.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/lezijatuxinorakevizovukan.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/83362055178.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2dd56d28c19c76682389d5f81141946c/56831034467.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jabimafofofufutige.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/85967924132.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/62217468268.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/vurevof.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412224bac7a---manotirabuxonom.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/46280357365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=verbal+aptitude+test+questions+and+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10932 bytes
SHA-256: 4419400dc45c5872143c9885850be030d1e206cdd04daa27b9ce35f4c48b5f2a
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 19832 bytes
SHA-256: 76ef236b9a7c3aa61f5359d63c9239e9b616b59601ddebfba5215264c3b0e9a7